What makes an add-on upgradeable?

[user65489751]

Hello everyone,

I recently took over the admin role for ~150 XenForo Instances. The company I work at, develops a few add-ons in-house and I was wondering how to upgrade them via CLI since my collegues apparently were only using the GUI which I really don't want to do on ~150 Forums.
The Documentation only gives me this:
[URL='https://xenforo.com/community/attachments/1692691246941-png.290170/'][/URL]
But that makes me wonder what makes an add-on upgradable? I only have the add-on files as .zip files and the only argument I can give is the...

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What makes an add-on upgradeable?

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